A guy on another forum I participate in just used Stockton Wheel to have 16" rims put on his 8-lug centers and was very happy with them.
I hope he doesn't mind me putting it here:
Stockton Wheel in Stockton, California just returned my rims. I sent 5 eight lug split rims to them where they removed my original centers, then welded on new 16" tubeless rims so I could run 16" radials. The choices in 15" radials for my truck were not that great and the profiles all looked too bulbous for me; I wanted the original look and found that I could best accomplish that with the 16" vintage radials from Diamond Back.
I dealt with Rob at Stockton Wheel and they did a great job. It took longer than expected but that was due to Stockton waiting for the custom outer rims to be manufactured by their supplier. Good outfit who knows their stuff and has been in business for over 100 years I think.